<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var arr =[1,2,3,4];
        // console.log(arr);
        var a = new Date();
        // console.log(a);
        var a =Math.random();
        var aa =a*9;
        console.log(Math.floor(aa));

    </script>
</head>
<body>

</body>
</html>